WorksheetsElectricity Final Review
Total questions: 61
Worksheet time: 1hrs 11mins
18 kΩ
Why is electrical wiring usually made from copper?
Because copper is shiny
Because copper conducts electricity
Because copper is not magnetic
Because copper insulate electricity
Why is electrical wiring usually are covered with a layer of plastic?
To make it look pretty
To help electricity flow along the wire
To make it safe
To add more energy
When the switch is closed the buzzer will sound because -
(I X R)
Voltage divided by Resistance
(V / R)
Current
Power
Ohms
Watts
Voltage divided by Current
(V / I)
Current
Power
Resistance
Watts
If the battery produced 12.6 Volts what would be the current flow for a 6 Ohm resistor?
2.1 Amps
2.4 Amps
1.71 Amps
15 Amps
How does an object become negatively charged?
by adding electrons
by removing protons
either adding electrons or removing protons
How does an object become positively charged?
by adding protons
by removing electrons
either by adding protons or removing electrons
Select all of the statements that are true.
Oppositely charged objects repel
Oppositely charged objects attract
Similarly charged objects repel
Similarly charged objects attract
Electrically connecting an object to the earth by means of a metal wire or other conductor is called
grounding
a circuit
neutral
negative charge
Identify letter C
filament
contact point
contact wire
glass bulb
Identify the circuit element
resistor
battery
switch
diode
Charge is measured in
coulombs
amperes
ohms
volts
Current is measured in units of
coulombs
amperes
ohms
volts
Resistance is measured in units of
coulombs
amperes
ohms
volts
What is the property of a resistor called?
Capacitance
Voltage
Resistance
Current
What does the long stem of a battery symbol indicate?
Negative terminal
Positive terminal
Ground
Neutral
What is the function of a switch in a circuit?
To store charge
To emit light
To open or close a circuit
To increase resistance
What is a closed circuit?
A circuit with a gap in the path of electrons
A circuit that is not connected in a loop
A circuit connected in a loop so the battery can power the device
A circuit with no battery
What is produced when charges move?
A magnetic field
A current
A static charge
A chemical reaction
What does a large current imply?
Few electrons flow toward the positive
A lot of electrons flow toward the positive
Electrons flow toward the negative
Protons flow toward the positive
What defines whether a material is a conductor or an insulator?
The color of the material
The density of the material
How easily electrons can flow in the material
The weight of the material
What is a key feature of all mechanical switches?
They have only one contact point.
They are always made of plastic.
They have at least two contact points.
They do not conduct electricity.
What happens when a "normally off" momentary switch is pressed?
The circuit remains open.
The circuit closes temporarily.
The circuit reverses direction.
The circuit increases voltage.
What are the two materials commonly used as electrodes in modern dry cells?
Copper and gold
Zinc and carbon
Lead and aluminum
Sodium and magnesium
What type of current do batteries provide?
Alternating current (AC)
Direct current (DC)
Static current
Variable current
What dictates the rate at which charge flows in a battery?
The size of the battery
The demand of the circuit
The color of the battery
The brand of the battery
What is the same for each element in a series circuit?
Voltage
Current
Resistance
Power
What happens when a large current flows through a fuse?
It lights up
It cools down
It "blows"
It changes color
What is the main difference between a fuse and a circuit breaker?
A fuse can be reset
A circuit breaker can be reset
A fuse increases current
A circuit breaker decreases voltage
What is electrical resistance?
A measure of how much a material resists the flow of current
A measure of how fast electrons move through a conductor
A measure of the voltage applied to a circuit
A measure of the power consumed by a device
